A good electrician would have to visit the site and gather information there to give you a valid quote.
You are into the multiple thousands of dollars however you go, too much depends on what you already have available. Then the VFD will be $1500 bare, bare minimum probably won't be happy with to $3000 for a nice working reliable one. No idea on phase converters and how hard a motor starts on one, IF it starts as hard as it does on three phase power then you will set new peak demand charges. Ones at work really get the conduits singing when starting.
Good luck
Ron